With the announcement of Rock Band 2 we found out that the instruments would be getting a bit of a update. However, since the original peripherals will be compatible with the new game, we know that there won't be any huge changes to the drums (like an extra pad and such). What we do know is that the 360 is getting wireless controllers.
According to the listing on Amazon, the Xbox 360 drum kit will in fact be wireless. The page also suggests that the retail price will be $89.99.
One might wonder why we would need a wireless set of drums. After all, they just sit there, so what's the big deal? After getting out and putting away my kit a few hundred times, I can honestly say I seriously want something wireless. Amazon says we'll be getting them September 14.